There are many factors to using a gun in self defense. To say there is only one way to do things in every situation is not logical.
To say that one will not be able to see anything because they are using sight alignment is not true. There are statistics that point to the facts over and over to show that by in large those who only point shoot hit their targets only about 15% to 20% of the time. S.W.A.T. teams use sight alignment and hit their targets about 85% of time. I would wager to say that members of S.W.A.T. know what is going on around them in hostile situations.
It would be foolish to not use your sights to shoot if your wife had a knife at her throat and was being held by a deranged madman who was using her as a shield and only had his head exposed.
There are also times to point shoot as well. Every hostile situation could call for different self defense techniques.
ROFLMAO! See a SWAT team raid,and from all the laser lights flying all over the place,you would swear you are in a scene from Star Wars. The reason they use these lasers is so they can point shoot. Usually the wrong person.